U.S. patent application number 13/388821 was filed with the patent office on 2012-06-28 for wireless communication system, mobile station apparatus and base station apparatus.
This patent application is currently assigned to SHARP KABUSHIKI KAISHA. Invention is credited to Yosuke Akimoto, Shoichi Suzuki.
Application Number | 20120163320 13/388821 |
Document ID | / |
Family ID | 43544285 |
Filed Date | 2012-06-28 |
United States Patent
Application |
20120163320 |
Kind Code |
A1 |
Akimoto; Yosuke ; et
al. |
June 28, 2012 |
WIRELESS COMMUNICATION SYSTEM, MOBILE STATION APPARATUS AND BASE
STATION APPARATUS
Abstract
To provide a wireless communication system, a mobile station
apparatus and a base station apparatus which reduce a resource
overhead in the transmission of an aperiodic SRS, and are not
accompanied with a major change from the specification of the LTE.
The wireless communication system includes the base station
apparatus and the mobile station apparatus transmitting a data
signal to the base station apparatus by SC-FDMA (Single Carrier
Frequency Division Multiple Access) system, and the mobile station
apparatus transmits a reference signal for channel measurement to
the base station apparatus, and the reference signal for channel
measurement is transmitted using a channel for data transmission
allocated for each of the mobile station apparatuses from the base
station apparatus.
Inventors: |
Akimoto; Yosuke; (Osaka-shi,
JP) ; Suzuki; Shoichi; (Osaka-shi, JP) |
Assignee: |
SHARP KABUSHIKI KAISHA
Osaka-shi, Osaka
JP
|
Family ID: |
43544285 |
Appl. No.: |
13/388821 |
Filed: |
July 29, 2010 |
PCT Filed: |
July 29, 2010 |
PCT NO: |
PCT/JP2010/062849 |
371 Date: |
March 15, 2012 |
Current U.S.
Class: |
370/329 |
Current CPC
Class: |
H04W 72/12 20130101;
H04L 5/0053 20130101; H04L 5/0057 20130101; H04L 25/0226 20130101;
H04L 5/0051 20130101; H04W 24/10 20130101; H04L 27/2613 20130101;
H04L 5/0023 20130101; H04J 11/00 20130101; H04J 2211/006
20130101 |
Class at
Publication: |
370/329 |
International
Class: |
H04B 15/00 20060101
H04B015/00; H04W 72/04 20090101 H04W072/04 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 4, 2009 |
JP |
2009-181766 |
Claims
1. A wireless communication system comprising a base station
apparatus and a mobile station apparatus transmitting a data signal
to said base station apparatus by SC-FDMA (Single Carrier Frequency
Division Multiple Access) system, said mobile station apparatus
transmitting a reference signal for channel measurement to said
base station apparatus, wherein said reference signal for channel
measurement is transmitted using a channel for data transmission
allocated for each said mobile station apparatus from said base
station apparatus.
2. The wireless communication system according to claim 1, wherein:
said base station apparatus allocates a channel for data
transmission to each of a plurality of mobile station apparatuses;
a first mobile station apparatus transmits a reference signal for
channel estimation used for data demodulation to said base station
apparatus; and a second mobile station apparatus transmits said
reference signal for channel measurement at the same time as the
time at which said first mobile station apparatus transmits said
reference signal for channel estimation, and said reference signal
for channel estimation and said reference signal for channel
measurement are mutually orthogonal sequences.
3. The wireless communication system according to claim 2, wherein
said reference signal for channel estimation and said reference
signal for channel measurement are generated by applying different
cyclic shifts to a CAZAC (Constant Amplitude and
Zero-AutoCorrelation) sequence.
4. The wireless communication system according to claim 2, wherein
said base station apparatus notifies said second mobile station
apparatus, using a downlink control channel, to transmit said
reference signal for channel measurement at the same time as the
time at which said first mobile station apparatus transmits said
reference signal for channel estimation, by applying exclusive OR
of a predetermined bit sequence to a CRC bit for error detection
added to uplink allocation information.
5. The wireless communication system according to claim 1, wherein
said mobile station apparatus maps an orthogonal code sequence of
said reference signal for channel measurement as said reference
signal for channel measurement to any of SC-FDMA symbols, and
transmits to said base station apparatus said orthogonal code
sequence of said reference signal for channel measurement and said
SC-FDMA symbol in association with a transmission antenna.
6. The wireless communication system according to claim 5, wherein
said base station apparatus allocates a channel for data
transmission to each of a plurality of mobile station apparatuses,
while performing allocation thereof so that a combination of the
SC-FDMA symbol that transmits said reference signal for channel
measurement and the orthogonal code sequence of said reference
signal for channel measurement is different for each said mobile
station apparatus.
7. The wireless communication system according to claim 5, wherein
a data signal or CQI (Channel Quality Indicator) is mapped to the
SC-FDMA symbol to which said orthogonal code sequence of said
reference signal for channel measurement has not been mapped, and
is transmitted to said base station apparatus.
8. A mobile station apparatus that transmits a data signal to a
base station apparatus by an SC-FDMA (Single Carrier Frequency
Division Multiple Access) system, wherein the mobile station
apparatus transmits a reference signal for channel measurement to
said base station apparatus using a channel for data transmission
allocated from said base station apparatus.
9. The mobile station apparatus according to claim 8, wherein said
reference signal for channel measurement is transmitted at the same
time as the time at which other mobile station apparatus transmits
said reference signal for channel estimation, while said reference
signal for channel estimation and said reference signal for channel
measurement are mutually orthogonal sequences.
10. A base station apparatus that performs radio communication with
a mobile station apparatus according to claim 9, wherein said base
station apparatus notifies said mobile station apparatus, using a
downlink control channel, to transmit said reference signal for
channel measurement at the same time as the time at which said
other mobile station apparatus transmits said reference signal for
channel estimation, by applying exclusive OR of a predetermined bit
sequence to a CRC bit for error detection added to uplink
allocation information.
Description
TECHNICAL FIELD
[0001] The present invention relates to a communication technology,
and more specifically, in a mobile communication system having a
base station apparatus and a mobile station apparatus which perform
transmission and reception, the present invention relates to a
technology for efficiently transmitting a sounding reference signal
compliant with MIMO and to a reception technology thereof.
BACKGROUND ART
[0002] In order to reduce an overhead of the SRS associated with
the MIMO application to an LTE uplink, methods as described in
Non-patent document 1 and Non-patent document 2 have been proposed.
In Non-patent document 1, reducing the logical number of
transmission ports by performing pre-coding on the SRS is proposed.
Specifically, when the number of antennas which a mobile station
apparatus has is four, multiplying this by a matrix of 3.times.4
makes it possible to reduce the number of antenna ports required
for the SRS, namely utilization of orthogonal resources, to three.
When the optimal rank and pre-coder are known in advance by a base
station apparatus, this method can reduce the number of
transmissions of the SRS sequence.
[0003] In Non-patent document 2, when the SRS is lacking, it is
proposed that information commanding one-time SRS transmission is
included in uplink resource allocation information to be
transmitted to each of the mobile station apparatuses by using a
downlink control channel. Here, periodic SRS transmission not less
than two times (two subframes) which is performed by one setting is
called periodic SRS, and the one-time SRS transmission (one
subframe) which is performed by one setting is called aperiodic
SRS. The method of the aperiodic SRS proposed in Non-patent
document 2 allows the SRS to be transmitted by using as a trigger
the timing at which the base station apparatus desires to perform
MIMO communication, and can reduce an overhead due to allocating
the periodic SRS resource excessively to the mobile station
apparatus.
PRIOR ART REFERENCE
Non-Patent Document
[0004] Non-patent document 1: R1-091738, "Precoded SRS for
LTE-Advanced", 3GPP TSG RAN WG1 Meeting #57, San Francisco, USA,
4-8 May 2009 [0005] Non-patent document 2: R1-091879, "SRS
Transmission Issues in LTE-A", 3GPP TSG RAN WG1 Meeting #57, San
Francisco, USA, 4-8 May 2009
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0006] However, Non-patent document 1 describes a method in which
determining a modulation scheme and a coding rate as one
application of the SRS is considered as a principal object, and by
the SRS with the logical number of antenna ports reduced by
performing the pre-coding, the rank and the pre-coder can not be
calculated. Therefore, there was a problem that two kinds of
settings where one is setting of the SRS for calculating the rank
and the pre-coder, and the other is setting of the SRS for
determining the modulation scheme and the coding rate were
needed.
[0007] The method of Non-patent document 2 transmits the SRS once
with one subframe by effectively using a vacant space of the SRS
subframe, and however, the resource will be secured even in the
case of not using the SRS. There is a problem that securing many
SRS regions which are not used is needed in order to enable the SRS
to be transmitted anytime in accordance with a situation, an
overhead will become large if flexibility is made high, and as a
result, the overhead reduction effect which was an object at the
beginning becomes small.
[0008] The present invention is accomplished in view of such a
situation, and the object is to provide a wireless communication
system, a mobile station apparatus and a base station apparatus
which reduce a resource overhead in the transmission of
above-mentioned aperiodic SRS, and are not accompanied with a major
change from the specification of the LTE.
Means for Solving the Problem
[0009] (1) In order to achieve above-mentioned object, the present
invention has taken the following measures. That is, the wireless
communication system of the present invention is a wireless
communication system comprising a base station apparatus and a
mobile station apparatus transmitting a data signal to the base
station apparatus by SC-FDMA (Single Carrier Frequency Division
Multiple Access) system, the mobile station apparatus transmitting
a reference signal for channel measurement to the base station
apparatus, wherein the reference signal for channel measurement is
transmitted using a channel for data transmission allocated for
each mobile station apparatus from the base station apparatus.
[0010] As described above, since the reference signal for channel
measurement is transmitted using the channel for data transmission
allocated for each mobile station apparatus from the base station
apparatus, an overhead associated with resource securement for
transmitting the SRS (reference signal for channel measurement) can
be reduced. In addition, since, without changing widely the
specification of the LTE, backward compatibility with a mobile
station apparatus compliant with an existing LTE is also
maintained, and radio physical structure of the LTE can be used as
it is, an impact to the specification also can be reduced.
[0011] (2) In the wireless communication system of the present
invention, the base station apparatus allocates a channel for data
transmission to each of a plurality of mobile station apparatuses;
a first mobile station apparatus transmits a reference signal for
channel estimation used for data demodulation to the base station
apparatus; and a second mobile station apparatus transmits the
reference signal for channel measurement at the same time as the
time at which the first mobile station apparatus transmits the
reference signal for channel estimation, and the reference signal
for channel estimation and the reference signal for channel
measurement are mutually orthogonal sequences.
[0012] As described above, the second mobile station apparatus
transmits the reference signal for channel measurement at the same
time as the time at which the first mobile station apparatus
transmits the reference signal for channel estimation, and the
reference signal for channel estimation and the reference signal
for channel measurement are mutually orthogonal sequences, and
therefore, the overhead associated with the resource securement for
transmitting the SRS can be reduced. In addition, since, without
changing widely the specification of the LTE, the backward
compatibility with the mobile station apparatus compliant with the
existing LTE is also maintained, and the radio physical structure
of the LTE can be used as it is, the impact to the specification
also can be reduced.
[0013] (3) In the wireless communication system of the present
invention, the reference signal for channel estimation and the
reference signal for channel measurement are generated by applying
different cyclic shifts to a CAZAC (Constant Amplitude and
Zero-AutoCorrelation) sequence.
[0014] As described above, since the reference signal for channel
estimation and the reference signal for channel measurement apply
the different cyclic shifts to the CAZAC (Constant Amplitude and
Zero-AutoCorrelation) sequence, the SRS can be transmitted by only
an SC-FDMA symbol for transmitting DMRS.
[0015] (4) In the wireless communication system of the present
invention, the base station apparatus notifies the second mobile
station apparatus, using a downlink control channel, to transmit
the reference signal for channel measurement at the same time as
the time at which the first mobile station apparatus transmits the
reference signal for channel estimation, by applying exclusive OR
of a predetermined bit sequence to a CRC bit for error detection
added to uplink allocation information.
[0016] As described above, since the base station apparatus applies
the exclusive OR of the bit sequence determined in advance to the
CRC bit for error detection added to the uplink allocation
information, UL Grant transmitted to each of a mobile station
apparatus A (the first mobile station apparatus) and a mobile
station apparatus B (the second mobile station apparatus) can be
discriminated.
[0017] (5) In the wireless communication system of the present
invention, the mobile station apparatus maps an orthogonal code
sequence of the reference signal for channel measurement as the
reference signal for channel measurement to any of SC-FDMA symbols,
and transmits to the base station apparatus the orthogonal code
sequence of the reference signal for channel measurement and the
SC-FDMA symbol in association with a transmission antenna.
[0018] As described above, since the orthogonal code sequence of
the reference signal for channel measurement and the SC-FDMA symbol
are made to be associated with each other to be transmitted to the
base station apparatus, the overhead associated with the resource
securement for transmitting the SRS can be reduced by a procedure
in which attention is focused on only one mobile station apparatus.
In addition, since, without changing widely the specification of
the LTE, the backward compatibility with the mobile station
apparatus compliant with the existing LTE is also maintained, and
the radio physical structure of the LTE can be used as it is, the
impact to the specification also can be reduced.
[0019] (6) In the wireless communication system of the present
invention, the base station apparatus allocates a channel for data
transmission to each of a plurality of mobile station apparatuses,
while performing allocation thereof so that a combination of the
SC-FDMA symbol that transmits the reference signal for channel
measurement and the orthogonal code sequence of the reference
signal for channel measurement is different for each mobile station
apparatus.
[0020] As described above, since allocation thereof is performed so
that the combination of the SC-FDMA symbol that transmits the
reference signal for channel measurement and the orthogonal code
sequence of the reference signal for channel measurement is
different for each mobile station apparatus, the SRS of a plurality
of the mobile station apparatus also can be multiplexed
simultaneously.
[0021] (7) In the wireless communication system of the present
invention, a data signal or CQI (Channel Quality Indicator) is
mapped to the SC-FDMA symbol to which the orthogonal code sequence
of the reference signal for channel measurement has not been
mapped, and is transmitted to the base station apparatus.
[0022] As described above, since the data signal or the CQI
(Channel Quality Indicator) is mapped to the SC-FDMA symbol to
which the orthogonal code sequence of the reference signal for
channel measurement has not been mapped, SC-FDMA symbols which have
not been allocated to the SRS transmission can be utilized
effectively.
[0023] (8) The mobile station apparatus of the present invention is
a mobile station apparatus that transmits a data signal to a base
station apparatus by an SC-FDMA (Single Carrier Frequency Division
Multiple Access) system, wherein the mobile station apparatus
transmits a reference signal for channel measurement to the base
station apparatus using a channel for data transmission allocated
from the base station apparatus.
[0024] As described above, the mobile station apparatus transmits
the reference signal for channel measurement to the base station
apparatus using the channel for data transmission allocated from
the base station apparatus, and therefore, can reduce the overhead
associated with the resource securement for transmitting the SRS
(reference signal for channel measurement). In addition, since,
without changing widely the specification of the LTE, the backward
compatibility with the mobile station apparatus compliant with the
existing LTE is also maintained, and the radio physical structure
of the LTE can be used as it is, the impact to the specification
also can be reduced.
[0025] (9) In the mobile station apparatus of the present
invention, the reference signal for channel measurement is
transmitted at the same time as the time at which other mobile
station apparatus transmits the reference signal for channel
estimation, while the reference signal for channel estimation and
the reference signal for channel measurement are mutually
orthogonal sequences.
[0026] As described above, the reference signal for channel
measurement is transmitted at the same time as the time at which
other mobile station apparatus transmits the reference signal for
channel estimation, while the reference signal for channel
estimation and the reference signal for channel measurement are
mutually orthogonal sequences, and therefore, the mobile station
apparatus can reduce the overhead associated with the resource
securement for transmitting the SRS. In addition, since, without
changing widely the specification of the LTE, the backward
compatibility with the mobile station apparatus compliant with the
existing LTE is also maintained, and the radio physical structure
of the LTE can be used as it is, the impact to the specification
also can be reduced.
[0027] (10) The base station apparatus of the present invention is
a base station apparatus that performs radio communication with a
mobile station apparatus according to claim 9, wherein the base
station apparatus notifies the mobile station apparatus, using a
downlink control channel, to transmit the reference signal for
channel measurement at the same time as the time at which the other
mobile station apparatus transmits the reference signal for channel
estimation, by applying exclusive OR of a predetermined bit
sequence to a CRC bit for error detection added to uplink
allocation information.
[0028] As described above, since the base station apparatus applies
the exclusive OR of the bit sequence determined in advance to the
CRC bit for error detection added to the uplink allocation
information, the mobile station apparatus can discriminate UL Grant
transmitted to each of a mobile station apparatus A (the first
mobile station apparatus) and a mobile station apparatus B (the
second mobile station apparatus).
Effect of the Invention
[0029] In accordance with transmission of the aperiodic SRS
according to the present invention, the overhead associated with
the resource securement for transmitting the SRS can be reduced. In
addition, since, without changing widely the specification of the
LTE, the backward compatibility with the mobile station apparatus
compliant with the existing LTE is also maintained, and the radio
physical structure of the LTE can be used as it is, the impact to
the specification also can be reduced.
BRIEF DESCRIPTION OF THE DRAWINGS
[0030] FIG. 1 is a functional block diagram illustrating a
configuration example of abase station apparatus according to an
embodiment of the present invention;
[0031] FIG. 2 is a functional block diagram illustrating a
configuration example of a mobile station apparatus according to an
embodiment of the present invention;
[0032] FIG. 3 is a sequence chart assuming that setting of the SRS
is performed from a base station apparatus according to a first
embodiment of the present invention to a mobile station apparatus A
and a mobile station apparatus B, and aperiodic SRS is
transmitted;
[0033] FIG. 4 is a figure illustrating specifically a method of
transmission of the SRS according to a first embodiment of the
present invention;
[0034] FIG. 5 is a sequence chart illustrating processing and
signal flow between a base station apparatus and a mobile station
apparatus according to a second embodiment of the present
invention;
[0035] FIG. 6 is a figure illustrating specifically a method of
transmission of the SRS according to a second embodiment of the
present invention;
[0036] FIG. 7 is a sequence chart illustrating a processing and
signal flow between a base station apparatus and a mobile station
apparatus according to a third embodiment of the present
invention;
[0037] FIG. 8A is a figure illustrating specifically a method of
transmission of the SRS according to the third embodiment of the
present invention (simultaneous transmission with CQI);
[0038] FIG. 8B is a figure illustrating specifically a method of
transmission of the SRS according to the third embodiment of the
present invention (simultaneous transmission with data);
[0039] FIG. 9 is a figure illustrating specifically a method of
transmission of the SRS in LTE;
[0040] FIG. 10 is a figure illustrating a detailed configuration of
a sounding subframe in the LTE; and
[0041] FIG. 11 is a figure illustrating a transmission method of
the SRS in the LTE.
BEST MODES FOR PERFORMING THE INVENTION
[0042] As a system of a next-generation cellular mobile
communication, in 3GPP (Third Generation Partnership Project) that
is an international standardization project, investigation has been
performed on the specification of a network into which W-CDMA
(Wideband-Code Division Multiple Access) and GSM (Global System for
Mobile Communications) have been evolved.
[0043] In the 3GPP, hitherto, the cellular mobile communication
system has been investigated, and the W-CDMA system has been
standardized as a third generation cellular mobile communication
system. HSDPA (High-Speed Downlink Packet Access) with a
transmission speed further improved also has been standardized, and
the service has been provided. Currently, in the 3GPP,
investigation is performed also on evolution of a third generation
radio access technology (Long Term Evolution: hereinafter, referred
to as "LTE"), and LTE Advanced aiming at further improvement of the
transmission speed (hereinafter, referred to as "LTE-A").
[0044] In transmission of uplink data in the LTE, a communication
system on the basis of SC-FDMA (Single Carrier Frequency Division
Multiple Access) based on resources allocated from a base station
apparatus is adopted. Specifically, a modulated transmission signal
is converted into a frequency domain signal by a DFT (Discrete
Fourier Transformation), and after being mapped to a frequency
resource allocated by the base station apparatus, converted into a
time domain signal by an IDFT (Inverse DFT) to be transmitted to
the base station apparatus. Here, the uplink data is given from an
upper layer, and corresponds to the data in which meaning of each
bit is not construed in a physical layer, and is made to be called
UL-SCH (Uplink Shared Channel) defined in a transport channel. The
data to be transmitted actually is one for which processing such as
encoding is performed on the UL-SCH, and is transmitted by a data
transmission channel called PUSCH (Physical Uplink Shared Channel)
allocated by the base station apparatus.
[0045] Although in the uplink of the LTE, antenna switching which
selects adaptively one transmission antenna from two transmission
antennas is only supported, application of space-multiplexing based
on MIMO (Multiple Input Multiple Output) is investigated in the
LTE-A as extension of the uplink system, and the data of the UL-SCH
is space-multiplexed and a plurality of sequences thereof are
transmitted. Here, a coding rate and modulation scheme which are
applied to the UL-SCH are calculated based on a sounding reference
signal (SRS: Sounding Reference Signal, a reference signal for
channel measurement) transmitted from the mobile station apparatus
to the base station apparatus. The SRS, besides this use, is used
for a use of frequency scheduling.
[0046] FIG. 9 is a figure illustrating specifically a method of
transmission of the SRS in the LTE. The base station apparatus sets
up a sounding subframe for all of the mobile station apparatuses
performing communication therewith, and specifically, the sounding
subframe is given an offset and period from a reference subframe.
The sounding subframe is common to all of the mobile station
apparatuses, which means that the SRS is transmitted in this
subframe.
[0047] FIG. 10 is a figure illustrating a detailed configuration of
the sounding subframe in the LTE. Where, in FIG. 10, only a band
which can be used for allocation of the PUSCH is described, and a
channel in which control information is transmitted is omitted. A
vertical axis in FIG. 10 is a frequency axis, and one block
indicates a subcarrier. In the LTE, contiguous twelve subcarriers
are collectively used as a resource allocation unit, which is
called a resource block (RB: Resource Block). On the other hand, a
horizontal axis is a time-axis, and time is divided by the unit in
which a frequency domain is converted into a time domain, and to
which a cyclic prefix is given. This is called one SC-FDMA
symbol.
[0048] In the LTE, seven contiguous SC-FDMA symbols constitute one
slot, and two slots collectively constitute one subframe. The
subframe has become a resource allocation unit in a time domain in
the LTE and LTE-A. As illustrated in FIG. 10, each SC-FDMA symbol
can be used for a different use, and the SC-FDMA symbol No. 3 is
used for transmission of a data demodulation reference signal
(DMRS: Demodulation Reference Signal (a reference signal for
channel estimation used for data demodulation)). The SC-FDMA symbol
No. 6 in the slot No. 1 is used for transmission of the SRS. The
other SC-FDMA symbols are used for data transmission. Here, as for
the DMRS and SRS, an orthogonal code is used for multiplexing with
other users and for antenna discrimination, and in the LTE, a
sequence with a CAZAC (Constant Amplitude and Zero-AutoCorrelation)
sequence cyclic-shifted on the time axis is used.
[0049] FIG. 11 is a figure illustrating a transmission method of
the SRS in the LTE. The base station apparatus performs setting
with respect to transmission of the SRS for each mobile station
apparatus. Here, the setting indicates setting up a position of the
subframe which the mobile station apparatus can use within the SRS
subframes by an offset and a period, while indicating a band which
the SRS supports, an SRS bandwidth transmitted in one subframe, and
from which antenna transmission is performed.
[0050] Describing specifically using FIG. 11, even number subframes
are set up as the SRS subframe here, and among them, {4, 8, 12, 16,
20, 24} subframes are allocated to this mobile station apparatus.
The band which the SRS of this mobile station apparatus supports is
A which is a part of a system bandwidth, and one third of the band
A, i.e., the band A1, A2 or A3 is transmitted by one SRS
transmission in a predetermined order. It is assumed that this
mobile station apparatus is provided with two transmission
antennas, and the SRS corresponding to one antenna is transmitted
by one subframe. Specifically in this example, antennas #0 and #1
are set up so that transmission may be performed at each
transmission timing by turns.
[0051] Although the SRS is transmitted by the above procedure in
the LTE, in order to support MIMO space-multiplexing, in the LTE-A,
a change of a transmission method of the SRS in accordance
therewith is needed. Specifically, although the number of pieces of
channel information corresponding to a transmission antenna which
the base station apparatus should have known is two in the LTE,
since the space-multiplexing by using a maximum of four
transmission antennas is supported in the LTE-A, an overhead which
is needed for the SRS in the LTE-A can become twice the LTE simply.
Furthermore, in LTE-A, calculating the number of space-multiplexing
(rank) according to a channel state using the SRS, and performing
an uplink communication according to that are preferable.
Furthermore, while performing pre-processing of a transmission
signal in advance to be transmitted is effective in order to
enhance quality of an uplink communication, calculation of the
optimal pre-processing sequence (pre-coder) is also needed to be
performed using the SRS. That is, in the LTE-A, in comparison with
the LTE, the highly frequent and highly accurate SRS transmission
must be realized. Hereinafter, embodiments of the present invention
will be described with reference to drawings.
First Embodiment
[0052] A mobile communication system according to a first
embodiment of the present invention has a base station apparatus
and a mobile station apparatus.
[0053] FIG. 1 is a functional block diagram illustrating a
configuration example of the base station apparatus according to an
embodiment of the present invention; The base station apparatus
according to the present embodiment includes a transmission section
110, a scheduling section 120, a reception section 130, and an
antenna 140. The transmission section 110 has an encoding part 111,
a modulation part 112, a mapping part 113, and a radio transmission
part 114. The scheduling section 120 is provided with a downlink
transmission resource information control part 121, an uplink
transmission resource information control part 122, a periodic SRS
transmission schedule control part 123, and an aperiodic SRS
transmission schedule control part 124, and a reception section 130
is provided with a radio reception part 131, a SRS separation and
calculation part 132, and a reverse mapping and demodulation
processing part 133. The antenna 140 is provided with only the
number required for transmitting a downlink signal and for
receiving an uplink signal.
[0054] Downlink data generated in the base station apparatus which
is to be transmitted to each of mobile station apparatuses, and
scheduling information for control information transmission which
is outputted from the scheduling section 120, are inputted into the
encoding part 111, and each of them is encoded according to a
control signal from the scheduling section 120, and an encoded bit
sequence is outputted. The control signal from the scheduling
section 120 is one that indicates information indicating a coding
rate, or an encoding method such as a turbo code, a tail biting
convolutional code, for example. A plurality of information items
may be encoded in combination, and each of information items may be
encoded individually. Here, the information provided from the
scheduling section 120 is characterized by including control
information with respect to transmission of the aperiodic SRS, and
indicates uplink resource allocation information (UL Grant) in
which for example, allocation information of the PUSCH, sequence of
the aperiodic SRS, information of a SC-FDMA symbol to be
transmitted or the like are included.
[0055] A plurality of outputted bit sequences of the encoding part
111 are inputted into the modulation part 112, and are each
converted into a symbol of modulation: BPSK, QPSK, 16QAM, or 64QAM
for example, according to the control signal from the scheduling
section 120, and are outputted. An output of the modulation part
112 is inputted into the mapping part 113 together with information
of a down link scheduling provided from the scheduling section 120,
and transmission data are generated. Here, the transmission data is
referring to an OFDM signal, for example, and the mapping operation
corresponds to an operation made to be associated with frequency
and time resources specified for each mobile station apparatus. If
space-multiplexing based on the MIMO is adopted, the processing
thereof will be performed in this block. Here, the control
information means resource allocation information to an uplink or a
downlink, i.e., information on transmission timing and a frequency
resource, a modulation scheme and a coding rate of an uplink or a
downlink signal, and a transmission request for CQI, PMI, and RI to
a mobile station apparatus, or the like.
[0056] A signal generated by the mapping part 113 is outputted to
the radio transmission part 114. In the radio transmission part
114, the signal is converted into a form suitable for a
transmission method, and if a communication system is based on an
OFDMA specifically, a time domain signal is generated by IFFT
(Inverse Fast Fourier Transformation) being performed to a
frequency domain signal. An output signal of the radio transmission
part 114 is supplied to the antenna 140, and is transmitted to each
of mobile station apparatuses from here.
[0057] The scheduling section 120 administers and controls control
information from an upper layer and information transmitted from a
mobile station apparatus, and performs resource assignment to each
of mobile station apparatuses, determination of a modulation scheme
and a coding rate, and control of these operations and the output
of the control information thereof or the like. The present
invention is characterized in that the scheduling section 120
administers a transmission timing (time resource), a resource block
(frequency resource), and a code resource of the aperiodic SRS.
[0058] The downlink transmission resource information control part
121 carries out scheduling and administration of a downlink
resource which each of mobile station apparatuses uses, while
performing generation of a control signal thereof. The uplink
transmission resource information control part 122 administers an
uplink resource which each of mobile station apparatuses uses,
while generating a control signal thereof. The periodic SRS
transmission schedule control part 123 administers a transmission
resource (a time resource, a frequency resource, a code resource)
of the periodic SRS applied to each of mobile station apparatuses,
while performing also setting and administration with respect to a
SRS subframe. The aperiodic SRS transmission schedule control part
124 administers a transmission resource (a time resource, a
frequency resource, a code resource) of the aperiodic SRS applied
to each of mobile station apparatuses, while performing also
generation and administration of the UL Grant for notification
thereof.
[0059] On the other hand, a signal transmitted from a mobile
station apparatus is inputted into the radio reception part 131
after received by the antenna 140. The radio reception part 131
accepts data and a control signal, and generates and outputs a
digital signal according to a transmission method. If an OFDM
method and a SC-FDMA method are specifically adopted, after
analog-to-digital conversion of the reception signal, a signal to
which FFT processing is performed in a unit of processing-time will
be outputted. Here, in the radio reception part 131, the signal is
divided into two types of signals such as a signal for measuring a
state of a channel of an uplink and a signal including information
to be administered as a data signal or control information to be
processed in an upper layer, for example, which are each outputted
as a first signal and a second signal.
[0060] The first output of the radio reception part 131 is
outputted to the SRS separation and calculation part 132. Here, the
aperiodic SRS or the periodic SRS included in the uplink signal is
extracted, and channel information of each of mobile station
apparatuses acquired therefrom is outputted to the scheduling
section 120. Specifically, the SRS has the possibility of being
multiplexed for each user or multiplexed with other information
depending on a time, frequency and code resource, and separation of
them is performed in accordance with resource allocation
information administered by the periodic SRS transmission schedule
control part 123 or the aperiodic SRS transmission schedule control
part 124.
[0061] The second output of the radio reception part 131 is
outputted to the reverse mapping and demodulation processing part
133. In the reverse mapping and demodulation processing part 133,
two or more types of information transmitted from the mobile
station apparatus are each demodulated and extracted using a
mapping pattern, a modulation scheme and coding rate which the
scheduling section 120 administers. Here, if the space-multiplexing
is applied to the uplink signal, and two or more types of
information having different communication quality is transmitted
simultaneously, a time and frequency position in which each of the
signal is included is separated in advance, and in accordance with
the control information inputted from the scheduling section 120,
reverse mapping and demodulation processing to which a different
modulation scheme, a coding rate and the number of
space-multiplexing are each applied are performed. Within signals
acquired by processing like this, what is to be processed in an
upper layer is outputted to the upper layer, and the control
information administered by the scheduling section 120, such as CQI
or RI, for example, is outputted to the scheduling section 120.
[0062] FIG. 2 is a functional block diagram illustrating a
configuration example of a mobile station apparatus according to an
embodiment of the present invention. Each of mobile station
apparatuses is provided with a reception section 210, a scheduling
information administration section 220, a transmission section 230,
and an antenna 240 as illustrated in FIG. 2. The reception section
210 is provided with a radio reception part 211, a demodulation
processing part 212, and a downlink channel calculation part 213.
The scheduling information administration section 220 is provided
with a downlink transmission resource information administration
part 221, an uplink transmission resource information
administration part 222, a periodic SRS transmission schedule
management part 223, and an aperiodic SRS transmission schedule
management part 224. The antenna 240 is provided with only the
number required for transmitting an uplink signal and for receiving
a downlink signal. The transmission section 230 is provided of an
encoding part 231, a modulation part 232, a mapping part 233 and a
radio transmission part 234.
[0063] When the antenna 240 receives a downlink signal transmitted
from the base station apparatus, this reception signal will be
inputted into the radio reception part 211. In the radio reception
part 211, besides analog-to-digital (A/D) conversion or the like, a
processing according to a communication system is performed, and
outputted. In the case of OFDMA specifically, a time-series signal
after A/D conversion is FFT-processed, and is converted into a time
and frequency domain signal, and is outputted.
[0064] An output signal of the radio reception part 211 is inputted
into the demodulation processing part 212. Meanwhile, the control
information such as the scheduling information of a downlink signal
outputted from the scheduling information administration section
220 (that is, information with respect to where a signal addressed
to its own station is allocated), the number of sequences of the
space-multiplexing, a modulation scheme and coding rate, is also
inputted to the demodulation processing part 212, and demodulation
processing is performed. A signal demodulated is classified
according to a type of the signal, and information to be processed
in an upper layer is given to the upper layer, and information to
be administered in the scheduling information administration
section 220 is inputted into the scheduling information
administration section 220. Here, the present invention is
characterized in that the information to be administered in the
scheduling information administration section 220 includes one
which relates to a resource (time, frequency, code resource)
transmitting the aperiodic SRS. The downlink channel calculation
part 213 calculates, with a channel calculating signal provided
from the radio reception part 211 as an input signal,
administrative information such as the number of sequences of the
space-multiplexing applicable to a downlink, a modulation scheme,
and a coding rate. This administrative information is inputted into
the scheduling information administration section 220.
[0065] The scheduling information administration section 220 also
administrates the control information transmitted from the base
station apparatus, and performs administration for transmitting the
control information calculated in the mobile station apparatus to
the base station apparatus. The downlink transmission resource
information administration part 221 administers downlink resource
information of its own station transmitted from the base station
apparatus, while performing transmission control of a downlink
signal. The uplink transmission resource information administration
part 222 administers uplink resource information of its own station
transmitted from the base station apparatus, while performing
transmission control of an uplink signal. In addition, the periodic
SRS transmission schedule management part 223, administers
transmission resources (a time resource, a frequency resource, a
code resource) of the periodic SRS transmitted from the base
station apparatus, while controlling the SRS transmission using
those resources, and in addition, performing administration with
respect to a SRS subframe. The aperiodic SRS transmission schedule
management part 224 administers transmission resources (a time
resource, a frequency resource, a code resource) of the aperiodic
SRS transmitted from the base station apparatus, while controlling
also generation of the aperiodic SRS using the resources
thereof.
[0066] The transmission section 230 performs transmission in uplink
resources to which information such as uplink data, the aperiodic
SRS, or the like is allocated. The downlink data and a signal
administered by the scheduling information administration section
220 are supplied to the encoding part 231 at the transmission
timing thereof, and the signal inputted will be encoded at a coding
rate which is different depending on each type thereof. An output
signal of the plurality of sequences is inputted into the
modulation part 232, and is modulated by a modulation scheme which
is different depending on each type thereof. This output is
outputted to the mapping part 233, and mapping of a signal is
performed in accordance with the number of space-multiplexing for
each transmission information and mapping position information.
Specifically, in the case where SC-FDMA is applied to a
transmission method, a signal is mapped to an allocated frequency
domain.
[0067] The signal mapped by the mapping part 233 is inputted into
the radio transmission part 234. In the radio transmission part
234, the signal is converted into a signal form to be transmitted.
Specifically, an operation or the like which converts a frequency
domain signal into a time domain signal by the IFFT and gives a
guard interval corresponds to this. An output of the radio
transmission part 234 is supplied to the antenna 240.
[0068] FIG. 3 is a sequence chart assuming that setting of the SRS
is performed from a base station apparatus according to a first
embodiment of the present invention to a mobile station apparatus A
and a mobile station apparatus B, and the aperiodic SRS is
transmitted. Although details are here omitted about a procedure in
which the periodic SRS is transmitted, coexisting with the
aperiodic SRS is also possible, and it is possible to apply the
same procedure as the present embodiment irrespective of timing of
the transmission time.
[0069] The base station apparatus notifies the mobile station
apparatus A and the mobile station apparatus B of a setting with
respect to the SRS (Step S101A, Step S101B). Here, a notification
of a SRS subframe and a notification of information with respect to
allocation information of the periodic SRS are performed. Here, it
is not necessary to complete a processing corresponding to Step
S101A and Step S101B by one subframe, and it may be performed using
several subframes. A mobile station apparatus notified of a setting
with respect to the SRS will transmit by using a resource with the
aperiodic SRS allocated in accordance with the setting. Here, the
resource is indicative of a time, frequency and code resource.
Where, since the aperiodic SRS and periodic SRS do not have
influence mutually, timing at which the periodic SRS is transmitted
will not be mentioned clearly here.
[0070] Next, the base station apparatus transmits the uplink
allocation signal (UL Grant) to the mobile station apparatus A, and
the mobile station apparatus B (Step S102A, Step S102B). Here, the
UL Grant transmitted to the mobile station apparatus A is one which
does not instruct to transmit the SRS, but instructs to transmit a
data signal and the DMRS, and has descriptions such as a position
of an allocated resource block, a modulation scheme, a coding rate,
an orthogonal code sequence (cyclic shift applied to CAZAC
sequence) of the DMRS. Receiving this, the mobile station apparatus
A generates a data signal in accordance with the UL Grant (Step
S103A), and also generates a DMRS signal (Step S104A). Then, in the
allocated time and frequency resource, the mobile station apparatus
A transmits the data signal and DMRS to the base station apparatus
(Step S105A).
[0071] FIG. 4 is a figure illustrating specifically a method of
transmission of the SRS according to a first embodiment of the
present invention. Here, as illustrated in FIG. 4, the DMRS shall
be mapped to the third SC-FDMA symbol.
[0072] On the other hand, in the UL Grant transmitted to the mobile
station apparatus B, information specifying transmitting the
aperiodic SRS is specified (Step S102B). Subsequently, the mobile
station apparatus B generates a sounding signal (Step S103B). Here,
difference from the UL Grant transmitted to the mobile station
apparatus A is the point that data transmission is not performed in
the mobile station apparatus B, and signal transmission is
performed only in a SC-FDMA symbol on which the DMRS is mapped.
[0073] As a method to discriminate these UL Grant, including an
discrimination bit in the UL Grant, and applying exclusive OR of a
specific sequence to a bit sequence of CRC (Cyclic Redundancy
Check) for error detection used for detection of the UL Grant, or
the like are included. As a configuration of the specific UL Grant,
a position of the allocated resource block and the orthogonal code
sequence (the cyclic shift applied to a CAZAC sequence) of the
aperiodic SRS are specified. This orthogonal code sequence may be
notified of by a portion corresponding to the number of antennas
transmitted here, or maybe determined by a specification in advance
so that one cyclic shift and the number of antennas are notified
of, and that the cyclic shift is determined uniquely. Here, as for
the orthogonal code sequence of the aperiodic SRS, a sequence which
is orthogonal to the DMRS of the mobile station apparatus A shall
have been selected. Specifically, used is the sequence with the
CAZAC sequence used for the DMRS of the mobile station apparatus A
cyclic-shifted.
[0074] The mobile station apparatus B having received the UL Grant,
as illustrated in FIG. 4, transmits the SRS by using only the third
SC-FDMA symbol in each slot, that is the SC-FDMA symbol in which
the mobile station apparatus A transmits the DMRS (Step S105B). In
the case where the two or more orthogonal sequences are allocated,
it is also possible to code-multiplex the SRS corresponding to the
two or more transmission antennas in this SC-FDMA symbol and carry
out transmission thereof. The SRS may be transmitted from antennas
different in a slot #0 and a slot #1. Information indicative of
changing frequency for each slot (frequency-hopping) may be
included in this UL Grant. Thereby, one-time SRS transmission
instruction allows a frequency band of a wider range to be
supported.
[0075] The base station apparatus having received a signal
transmitted from the mobile station apparatus A and mobile station
apparatus B (Step S106) performs despreading processing on the
third SC-FDMA symbol with the DMRS and aperiodic SRS transmitted
therein (Step S107). Thereby, the base station apparatus can know
the channel corresponding to each antenna of the mobile station
apparatus B. By the above procedure, transmission of new SRS
compliant with a physical structure of an existing system will
become possible.
Second Embodiment
[0076] FIG. 5 is a sequence chart illustrating processing and
signal flow between a base station apparatus and a mobile station
apparatus according to a second embodiment of the present
invention. As for configurations of the base station apparatus and
the mobile station apparatus, ones which are the same
configurations as illustrated in FIG. 1 and FIG. 2 can be used.
Here, the different point from the first embodiment is that
transmitted is the aperiodic SRS using data transmission domains
(that are the 0th, first, second, forth, fifth, and sixth SC-FDMA
symbol in FIG. 4) of the PUSCH. Besides, in the present embodiment,
a procedure in which attention is focused on only one mobile
station apparatus is described, and however, it is also possible to
extend the same procedure to a plurality of mobile station
apparatuses by applying TDMA, FDMA, and CDMA.
[0077] The base station apparatus notifies the mobile station
apparatus of a setting with respect to the SRS (Step S201). Here, a
notification of the SRS subframe and a notification of information
with respect to allocation information of the periodic SRS are
performed. Here, it is not necessary to complete a processing
corresponding to Step S201 by one subframe, and it may be performed
using several subframes. The mobile station apparatus which is
notified of the setting with respect to the SRS will transmit by
using a resource with the aperiodic SRS allocated in accordance
with the setting. Here, the resource is indicative of a time,
frequency and code resource. Where, since the aperiodic SRS and
periodic SRS do not have influence mutually, timing at which the
periodic SRS is transmitted will not be mentioned clearly here.
[0078] Next, the base station apparatus transmits an uplink
allocation signal (UL Grant) to the mobile station apparatus (Step
S202). In the UL Grant received here, information specifying
transmitting the aperiodic SRS is specified. Here, a difference
from the UL Grant for the aperiodic SRS transmission illustrated in
the first embodiment is that included is the information which
indicates a relation among the SC-FDMA symbol in which the
aperiodic SRS is transmitted, the orthogonal code sequence, and a
transmission antenna corresponding thereto. As a configuration of
the specific UL Grant, specified are a position of the allocated
resource block, position information of the available SC-FDMA
symbol, and the orthogonal code sequence of the aperiodic SRS
(cyclic shift).
[0079] The position information of the available SC-FDMA symbol is
configured by 7 bits, and the SRS may be made to be transmitted
sequentially from the antenna 1 in the order of allocated SC-FDMA
positions.
[0080] While what kind of sequence may be used for a sequence of
the SRS, a CAZAC sequence or the like that is an orthogonal
sequence in which the amplitude becomes constant in the frequency
domain can be used. Applying the cyclic shift to this allows a
plurality of the mobile station apparatus also to be multiplexed
simultaneously. In accordance with the above-mentioned processing,
the mobile station apparatus generates a SRS signal (Step S203),
and transmits the aperiodic SRS to the base station apparatus using
the allocated time (subframe, slot, SC-FDMA symbol), frequency and
code (Step S204).
[0081] FIG. 6 is a figure illustrating specifically a method of
transmission of the SRS according to a second embodiment of the
present invention. Here, as indicated in FIG. 6, the SRS shall be
mapped to the 0th, first, fourth, and fifth SC-FDMA symbols other
than the third SC-FDMA symbol, for example.
[0082] The base station apparatus having received a signal
transmitted from the mobile station apparatus (Step S205) performs
despreading processing on the SC-FDMA symbol with the aperiodic SRS
transmitted (Step S206). Thereby, the base station apparatus can
know the channel corresponding to each antenna of the mobile
station apparatus. By the above procedure, transmission of new SRS
compliant with the physical structure of the existing system will
become possible.
Third Embodiment
[0083] FIG. 7 is a sequence chart illustrating processing and
signal flow between a base station apparatus and a mobile station
apparatus according to a third embodiment of the present invention.
As for configurations of the base station apparatus and the mobile
station apparatus, ones which are the same configurations as
illustrated in FIG. 1 and FIG. 2 can be used. Here, the different
point from the first and second embodiment is that transmitted is
the aperiodic SRS using data transmission domains (that are the
0th, first, second, forth, fifth, and sixth SC-FDMA symbol in FIG.
4) of the PUSCH, and at the same time, transmitted are signals
other than the SRS, such as a data signal in SC-FDMA symbols which
are not used.
[0084] The base station apparatus notifies the mobile station
apparatus of a setting with respect to the SRS (Step S301). Here, a
notification of the SRS subframe and a notification of information
with respect to allocation information of the periodic SRS are
performed. Here, it is not necessary to complete a processing
corresponding to Step S301 by one subframe, and it may be performed
using several subframes. The mobile station apparatus notified of
the setting with respect to the SRS will transmit by using a
resource with the aperiodic SRS allocated in accordance with the
setting. Here, the resource is indicative of a time, frequency and
code resource. Where, since the aperiodic SRS and periodic SRS do
not have influence mutually, timing at which the periodic SRS is
transmitted will not be mentioned clearly here.
[0085] Next, the base station apparatus transmits the uplink
allocation signal (UL Grant) to the mobile station apparatus (Step
S302). In the UL Grant received here, information specifying
transmitting simultaneously the aperiodic SRS and the other
information is specified. For example, a case where the aperiodic
SRS and CQI (Channel Quality Information) is transmitted
simultaneously is included. In this case, in the UL Grant,
information notifying to transmit the aperiodic SRS and CQI
simultaneously is included.
[0086] FIG. 8A is a figure illustrating specifically a method of
transmission of the SRS according to a third embodiment of the
present invention (simultaneous transmission with CQI). The mobile
station apparatus allocates the CQI and the aperiodic SRS as
illustrated in FIG. 8A. That is, in the 0th, first, fifth, and
sixth SC-FDMA symbol of the slot #0 and the #1, the aperiodic SRS
is allocated, and the DMRS for data signal demodulation is
transmitted in the third SC-FDMA symbol of each slot, and, in the
other SC-FDMA symbols, a data signal is transmitted. Furthermore,
as another example, a case where the aperiodic SRS and data are
transmitted simultaneously is included.
[0087] FIG. 8B is a figure illustrating specifically a method of
transmission of the SRS according to a third embodiment of the
present invention (simultaneous transmission with data). In this
case, as a method of notifying of transmitting with the aperiodic
SRS included in the UL Grant, included are providing 1 bit which
indicates existence of the aperiodic SRS, and applying exclusive OR
of a specific sequence to a bit sequence of CRC (Cyclic Redundancy
Check) for error detection used for detection of the UL Grant or
the like. Subsequently, the mobile station apparatus generates a
sounding signal (Step S303). Next, the mobile station apparatus
generates CQI or a data signal which is transmitted simultaneously
with the aperiodic SRS (Step S304).
[0088] The mobile station apparatus allocates the data signal and
the aperiodic SRS as illustrated in FIG. 8B. That is, the aperiodic
SRS corresponding to the number of antennas is code-multiplexed in
the sixth SC-FDMA symbol of the slot #1, and the DMRS for the data
signal demodulation is transmitted in the third SC-FDMA symbol of
each slot, and, in the other SC-FDMA symbols, a data signal is
transmitted (Step S305).
[0089] The base station apparatus having received a signal
transmitted from the mobile station apparatus (Step S306) performs
despreading processing on the SC-FDMA symbol with the aperiodic SRS
transmitted therein (Step S307). Thereby, the base station
apparatus can know the channel corresponding to each antenna of the
mobile station apparatus. By the above procedure, transmission of
new SRS compliant with the physical structure of the existing
system will become possible.
[0090] In each embodiment described above, by that a program for
realizing each function in the base station apparatus and each
function in the mobile station apparatus is made to be recorded on
a computer-readable recording medium, and the program recorded on
this recording medium is made to be read into a computer system,
and be executed, then control of the base station apparatus or the
mobile station apparatus may be performed. Besides, the term
"computer system" here shall include an OS and hardware such as a
peripheral device.
[0091] In addition, the "computer-readable recording medium" means
a portable medium such as a flexible disk, a magnetic-optical disk,
a ROM, and a CD-ROM, and a storage device such as a hard disk built
in a computer system. Furthermore, the "computer-readable recording
medium" shall also include one which holds the program dynamically
during short time, such as a communication line where a program is
transmitted via a network such as the Internet, or a communication
line such as a telephone line, and one which holds the program for
a certain period of time such as a volatile memory inside a
computer system which will be, in that case, a server or a client.
In addition, the above-mentioned program may be one for realizing a
part of the above-mentioned function, and further, may be one which
can realize the above-mentioned function in combination with a
program already recorded on the computer system.
[0092] As mentioned above, while embodiments of this invention have
been explained in full detail with reference to drawings, the
specific configurations are not limited to these embodiments, and
design etc. within a scope not departing from the purport of this
invention are included in the scope of Claims.
DESCRIPTION OF SYMBOLS
[0093] 110 Transmission section [0094] 120 Scheduling section
[0095] 121 Downlink transmission resource information control part
[0096] 122 Uplink transmission resource information control part
[0097] 123 Periodic SRS transmission schedule control part [0098]
124 Aperiodic SRS transmission schedule control part [0099] 130
Reception section [0100] 210 Reception section [0101] 220
Scheduling information administration section [0102] 221 Downlink
transmission resource information administration part [0103] 222
Uplink transmission resource information administration part [0104]
223 Periodic SRS transmission schedule management part [0105] 224
Aperiodic SRS transmission schedule management part [0106] 230
Transmission section
* * * * *